Pipe-threading machine.



G. W. LA v00.

PIPE THREADING MACHINE.

APPLICATION FILED NOV. 15, 1913. 1,126,792 Patented Feb.2, 1915.

3 SHEETSSHEET- 1.

| l l l l 1 l l WITNESSES: IN VENTOR.

w, BY 5%. m0 y A TT ORNE Y.

G. W. LA V00.

PIPE THREADING MACHINE.

' APPLIGATION FILED NOV. 15, 1913.

Patented Feb. 2, 1915.

3 SHEETS-SHEETZ.

INVENTOR. lu Q1 A. [5 W A TTORNEY GLW. LA.V00. PIPE THREADING MACHINE. APPLICATION FILED NOV.15, 191s.

Patented Feb. 2, 1915.

3 SHEETS-SHEET 3.

IN VEN TOR. 0 LL 7 A TT ORNE' Y.

WITNESSES.

;My invention relates GEORGE W. LA V00, 0]! STETTBENVILLE, OHIO.

IPIPE-THREADING MACHINE.

To all whom it may concern:

Be it known that I, Gnonon W. LA'VOO, a citizen of the United States, residing at Steubenville, in the county of Jefferson and State of Ohio, have invented new and useful Improvements in Pipe-Threading Machines, of which the following is a specification.

to machines for threading metal pipe.

The objects of my invention are to provide means whereby the pipe, at the conclusion of the threading operation, automatically opens the scroll; to provide a springoperated latch for releasing the scroll, the latch. being tripped by the pipe when the threading thereof is finished; and to facilitate theremoval and insertion of the thread- .ing dies.

Other objects .will appear hereinafter.

Referring to theaccompanying drawings, Figure 1 is partly a side elevation and partly a vertical central longitudinal section of a machine embodying my invention;

- Fig. 2, an end elevation of Fig. 1; Fig. 3, a

top plan view thereofgwFig. 4, a similar view of a portion of Fig. 3 with the parts in a different position; Fig. 5, an elevation of the threading head and the scroll therefor; Fig. 6, a perspective view of the scroll-locking and releasing catch; Fig. 7, a perspective view of the reamer; Fig. 8, a side view of the sleeve for holdin the reamer and the trip-bar for the said atch; Fig. 9,an end view of Fig. 8; and Fig. 10, a perspective view of the said trip-bar.

On the drawings, 1 represents the table on which the fixed sup ort 2 for the rotary chuck 3 .is mounted? 4 is the drive-wheel for rotating the chuck, to which wheel suitable power may be connected.

--to the carriage 5 by the 5.is a carriage caused to slide on the table 1 by means of the hand lever 6, connected to the table 1 by the pivot or fulcrum pin 7. The lever 6 is pivotally connected by the link 8 to the lower end 0 the lever 9, having its upper end pivoted pin 10 and its intermediate' portion to the table by the pin 11.

The carriagev 5 supports the head 12 which in turn supports the die-head 13 and various other. parts to be presently described. The die-head has on its rear face the axially arranged boss 14 provided with the grooves .15. The front face of the heady Specification of Letters Eatcnt.

Patented Feb. 2, 1915.

Application flied November 15, 1913. Serial No. 801,138.

12 has the horizontal recess 16 with its forward end provided with the flanges 17 extending inwardly from the upper and lower edges thereof. The boss l lis slid laterally irfi the said recess with the flanges 17 in t e the head 13 is in alinement with the opening 18 in the head 12. As shown on Fig. 1, the boss fits loosely in the recess as also do the flanges 17 .in the said grooves so that the head 13 may float or move slightly in any direction transversely of the axis of the head 13 or of the pipe 48 to be threaded to accommodate itself to slight irregularities in the ends of the pipes during the threading operation. I

The sleeve or. barrel 19 is held in the opening 18 by means of the set-screw '20 (Fig. 2) working in the nut 21 and having its inner end in engagement with the sleeve or barrel. The forward end of the sleeve is flush with the bottom of The said recesses 1n the die-holders form a round opening in substantial alinement with the opening in the heads 12 and 13.

V the recess 16' so that it will not interfere with the sliding,

grooves 15 until the axial opening in 2.6 is a'horizontal scroll rotatable on the center pin 27 supported by the head 13. The scroll 26 is provided with the two opposite scroll slots 28 beginning at opposite sides of the pin 27 and extending in opposite directions in'a manner well-known in the art. These slots receive the tending upwardly on the top of the dief --holders 23. In a manner well understood in the art the rotation of the scroll in one direction closes the die carriers and its rotation in the opposite direction opens the- In order to allow for the herein de-z same. scribed floating movement of the die-head vertical pins 29 ex-' 13 I have made the inner ends of the slots 7 28 on a radius drawnfrom the center of the in-27 so that any movement of the pins 29 in the slots caused by the floating movement cated by the arrow on Fig. 4. The catch of the die head and, therefore, of the diecarriers 23 will have. no tendency to move the pins 29 outwardly and thereby partiallyopen the threading dies.

30'is a horizontal sliding catch supported in the upper end of the head 12 and having its forward end in enga ement with the periphery of the scroll. he scroll has in its edge the notch 31 into which the end of the catch 30 is adapted to extend to prevent the rotation of the scroll in such a direction as to spread the pins 29 apart. The periphery of the scroll is provided with the annular groove 32 in which one end of the spring 33 is secured, the other end of the spring being connected to the bracket 34, on the rear end of the head 12. The spring 33 is partially wound on the scroll'in such a direction as to cause the scroll,'when released from the catch 30, to rotate in a direction to spread the pins 29 and open the dies, the direction of rotation being indi- 30 has its rear end connected by the jpivot 35 to the upstanding lever 36 which is pivoted at its lower end to the bracket 37 projecting rearwardly from the head 12. 8 is a spring connected between the upper end of the lever 36 and the post 39 on the top of the head 12, for yieldingly holding the catch 30 in constant engagement with the periphery'of the scroll. The sleeve 19 is provided with a central longitudinal rectangular opening 40 in which the reamer holder having a cross section corresponding to the ,shape of the opening40 is reciprocable. The forward end of the holder 41 is provided with the removable cutter or reamer blade 42 tapered forwardly and arranged to remove the bur from the inner end of the pipe just prior to the conclusion of the threading operation. The holder 41 has its "rear end resting against the spring 43 secured to the rear end 0 the head 12, the spring holding the reamer yieldingly in working position. By this arrangement the reamer will be pushed forwardly farther in order to ream large pipes and will be moved in the opposite irection when smaller pipes are to be reamed, thereby obviating the necessity of changing reamers for every size of pipe to be reamed: The u'pperwall of theopening is provided with the' longitudinal recess or groove 44"w'hich registers with the longitudinal recess or groove 45 in the lower face 'of the reamer carrier 41.

46 is a trip bar shaped in cross section to fit the registering grooves 44 and 45,- the said bar having its rear end resting against the adiustable screw 47 secured in the lever 36. The-forward end of the bar- 46 is arranged to be engaged by the end of-the pipe 48 at the'conclusion of'the threading opera tion. By using-the trip-bar 46, rather than ,drawn from the notch threadi'n for holding and rotatin ported by the carriage, a

of the said pipe,

the reamer,

changed for every size of pipe, as Would be required if the reamer tripped the scroll, because the reamer holder 41 would have different distances to. travel according to the'sizes of the pipe. 'ith a large pipe the blade 12 would be positioned farther forwardly than it would with a smaller pipe. Accordingly, a large pipe would have a longer portion of its end threaded than a smaller pipe before the scroll would be released.

49 is a vertical upstanding pin on the top of the scroll 26, disposed so as to be brought against the forward end of the stop 50, which I have shown in the form of an L- shaped bar secured to the rear end of the table 1.

The operation is as follows: The pipe to be threaded is secured in the-chuck 3 which is then set in operation by power-supplied to the gear-wheel 4. The operator moves the lever 6 so as to move the carriage 5 toward the right-hand of the pipe and cause the closed dies to slide partially over the end of the pipe. Immediately before the conclusion of the threading operation the end of the pipe engages the trip bar 46 which, through the adjusting screw 47 and the lever 36 causes the latch 30 to be with- 31 in the scroll. Prior to the release of the latch from the scroll the parts are as shown on Figs. 1,2,

3, and 5, but uponithe movement of theposition shown on Fig. 4, where the pins 29 are spread apart farther thanin Fig. 3. The spreading apart of the pins 29 opens the dies thereby withdrawing the dies from the threads on the pipe. The operator then moves the handle 6 so as to cause the table move to the right and in doing so causes the pin 49 on the scroll to engage the stop 50 which rotates the scroll to the-left until it is again locked'in the position shown on Fig. 3 by the latch 30 reengaging the notch 31. Justprior tothe completing of the peration, the reamer 42 removes the bur rom the end of the pipe, the spring 43 allowing thereamer to move slightly to the right. I

Iclaim- 1. In a pipe threading machine, a chuck a pipe axially, a reading dies supscroll for closin and openingthe dies with respect to the en means for feeding the dies toward the pipe and backing the'same away therefrom,- a stop,- arranged to arrest the backward movement of a portion of the scroll at one side of the axis thereof while permitting the axis carriage, a plurality of t of-the scroll to continue its backward movement, thereby causing the flotation of the scroll and the closing of the res.

2. In a pipe threading machine, a chuck for holding and rotating a pipe axially, a carriage, a plurality of ported by thecarriage, a scroll for closing and opening the dies with respect to the end of the said pipe, means for feeding the dies toward the pipe and backing the same away therefrom, a pin secured eccentrically to the scroll, and a stop arranged to arrest the backward movement of the said pin while the axis of the scroll continues its backward movement, thereby causing therotation of the scroll and the closing of the dies.

3. In a pipe threading machine, a plurality of threading dies, a scroll for closing and opening the same, means tending to move the scroll so as to open the dies, a latch to prevent the scroll from opening the dies, a head to support the dies, a reamer in the head, having a cutting edge inclined for- -wardly and toward the center of the head and arranged to enter the end of the pipe and ream the interior corner of the said end,

a spring for urging the reamer toward the end of the pipe, a slidable trip-bar in the head, arranged to be moved by the pipe at the close of the threading operation, and means for causing the trip-bar when so moved to release the latch from the scroll.

l. In a pipe threading machine, a plurality of threading dies, a scroll for closing and threading dies supopening the same, the scroll so as to open the dies, a latch to prevent the scroll from opening the dies, :1 head to support the dies, the head having an angular opening in alinement with the pipe, at reamer therein for engaging the end of the pipe, a slidable trip-bar in a slot in the reamer and sleeve arranged to be moved by the pipe at the close of the threading opera tion, and means, for causing the trip-bar when so moved torelease the latch from the scroll.

5. In a pipe-threading machine, a plurality of die-holders pivoted at one end to swing transversely of the pipe, and having their remaining ends provided with pins in line therewith, a peripherally-notched scroll having cam-slots to receive the pins, means tending to rotate the scroll so as to move the die-holders away from each other, a latch movable in a path transverse of the axis of the scroll to enter a peripheral notch in the scroll and thereby prevent the scroll from moving the die-holders away from each other, and means controlled by the forward end of the pipe for withdrawing the latch from the said notch.

Signed at Steubenville, 0., this 10th day of November, 1913.

enonen w LA voo.

Witnesses i J. H. STEVE NS, W. T. BURT, Jr.

means tending to move 

